<template>
  <view class="main">
    <!-- 内容列表 -->
    <scroll-view scroll-y class="viewport">
      <!-- 购物车列表  判断是否已经登录-->
      <template v-if="userStore.profile.id">
        <!-- 优惠提示 -->
        <view class="tips">
          <text class="label">满减</text>
          <text class="desc">满1件, 即可享受9折优惠</text>
        </view>
        <view class="blank" v-show="list.length === 0">
          购物车还是空的，快来挑选好货吧
        </view>
        <!-- 购物车商品 -->
        <view class="carts">
          <uni-swipe-action>
            <uni-swipe-action-item class="swipe-cell" v-for="item in list" :key="item.skuId">
              <navigator hover-class="none" :url="'/pages/goods/index?id=' + item.id" class="card">
                <!-- 阻止冒泡 stop -->
                <!-- 阻止默认行为 prevent -->
                <text @click.stop="onItemCheck(item.skuId, !item.selected)" class="checkbox"
                  :class="[`icon-${item.selected ? 'checked' : 'ring'}`]"></text>
                <!-- 商品缩略图 -->
                <image class="thumb" :src="item.picture"></image>
                <view class="meta">
                  <!-- 商品名称 -->
                  <view class="name ellipsis">{{ item.name }}</view>
                  <!-- 商品类型 -->
                  <view class="type ellipsis">{{ item.attrsText }}</view>
                  <!-- 价格 -->
                  <view class="price"> ¥{{ item.price }} </view>
                  <!-- 商品数量，阻止冒泡 -->
                  <view class="quantity" @tap.stop="() => { }">
                    <uni-number-box @change="onCountChange($event, item.skuId)" v-model="item.count" :min="1"
                      :max="item.stock" />
                  </view>
                </view>
              </navigator>

              <template v-slot:right>
                <view class="swipe-cell-action">
                  <button class="delete-button" @click="onDelete(item.skuId)">删除</button>
                </view>
              </template>
            </uni-swipe-action-item>
          </uni-swipe-action>
        </view>
      </template>
      <view class="blank" v-else>
        <text>登后后可查看购物车中的商品</text>
        <navigator url="/pages/login/index" hover-class="none">
          <button class="button">去登录</button>
        </navigator>
      </view>
      <!-- 状态提示 -->
    </scroll-view>

    <!-- 底部操作栏 判断是否已经登录 -->
    <view class="toolbar" v-if="userStore.profile.id">
      <text class="all" :class="{ checked: isAllChecked }" @click="onToggleCheck">全选</text>
      <text class="text">合计:</text>
      <text class="amount">{{ totalPrice }}</text>
      <!-- 操作按钮 -->
      <view class="buttons">
        <!-- 没有要结算的数量 才显示 禁止 -->
        <view class="button payment" :class="{ disabled: totalCount === 0 }" @click="goPayPage">
          去结算({{ totalCount }})
        </view>
      </view>
    </view>
  </view>
</template>
<script setup>
/* 
1 先判断用户是否已经登录   
  1 已经登录 显示 购物车数据 
  2 已经登录 显示 底部操作栏 
2 再判断购物车
  1 如果购物车没有数据 显示 =>  购物车为空 提示 
 */
import { ref, computed } from "vue";
import { getCartsAPI, updateCartAPI, memberCartSelected, delCartByIdAPI } from "@/api/cart";
import { useUserStore } from "@/store";
import { onShow } from "@dcloudio/uni-app";
const userStore = useUserStore();
const list = ref([])

const loadData = async () => {
  const { result } = await getCartsAPI();
  list.value = result;
}
onShow(() => {
  loadData();
})

// 商品的选中切换
const onItemCheck = async (skuId, selected) => {
  await updateCartAPI(skuId, { selected })
  // 刷新数据
  loadData();
}

// 筛选出,所有已经勾选了商品 组成新的数组
const selectedList = computed(() => {
  return list.value.filter(v => v.selected)
})

// 根据小商品的选中状态来计算 全选的状态 
const isAllChecked = computed(() => {
  // 计算全选的逻辑
  // 判断一下 选中的商品数量 是否等于 全部的商品的数量
  // 细节  0 = 0 
  // if (list.value.length) {
  //   return   selectedList.value.length === list.value.length
  // } else {
  //   return false
  // }
  return list.value.length && selectedList.value.length === list.value.length
})

// 点击全选按钮 切换小商品的选中状态
const onToggleCheck = async () => {
  const checked = !isAllChecked.value;
  await memberCartSelected(checked)
  loadData()
}

// 统计总价格 
const totalPrice = computed(() => {
  // reduce  累加  html  求和 
  return selectedList.value.reduce((a, b) => a + b.nowPrice * b.count, 0)
})
// 统计总数量 
const totalCount = computed(() => {
  // reduce  累加  html  求和 
  return selectedList.value.reduce((a, b) => a + b.count, 0)
})

// 数量的编辑
const onCountChange = async (count, skuId) => {
  // console.log(count, skuId);

  await updateCartAPI(skuId, { count })
  loadData()
}

// 删除 购物车
const onDelete = async (skuId) => {
  const { confirm } = await uni.showModal({ title: '提示', content: "您确定要删除吗" })
  if (confirm) {
    await delCartByIdAPI([skuId])
    loadData()
  }

}

// 点击去结算
const goPayPage = () => {
  // console.log(1);

  if (totalCount.value === 0) {
    // 不往下执行
    return
  }

   // 执行正常业务 !   新的页面中  -  获取订单信息...

  /* 
  1 直接跳转到  填写订单页面
  2 填写订单页面  发送请求 获取 预付订单信息 -  读取了你购物车数据 自动汇总计算 得出  数据 
  3 预付订单信息  开始渲染页面  
  
   */
   uni.navigateTo({ url: '/pages/order/create/index' })
}

</script>
<style lang="scss">
page {
  background-color: #f7f7f8;
  height: 100%;
}

.main {
  height: 100%;
  display: flex;
  flex-direction: column;
}

.viewport {
  min-height: 400rpx;
}

/* 顶部工具栏 */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 88rpx;
  padding: 0 30rpx;
  font-size: 26rpx;
  color: #262626;
  background-color: #fff;

  .extra {
    display: flex;
    align-items: center;
    height: 24rpx;
    border-left: 1rpx solid #bfbfbf;

    .edit {
      padding: 0 30rpx;
    }

    .menu {
      width: 9rpx;
      height: 9rpx;
      padding: 14rpx;
      border-radius: 50%;
      background-color: #262626;
      background-clip: content-box;
      position: relative;

      &::before {
        left: 0;
      }

      &::after {
        right: 0;
      }
    }
  }
}

.topbar .extra .menu::before,
.topbar .extra .menu::after {
  position: absolute;
  top: 50%;
  content: "";
  width: 6rpx;
  height: 4rpx;
  background-color: #8c8c8c;
  transform: translateY(-50%);
  border-radius: 4rpx;
}

/* 优惠提示 */
.tips {
  display: flex;
  align-items: center;
  line-height: 1;
  padding: 30rpx;
  font-size: 26rpx;
  color: #666;

  .label {
    color: #fff;
    padding: 7rpx 15rpx 5rpx;
    border-radius: 4rpx;
    font-size: 24rpx;
    background-color: #27ba9b;
    margin-right: 10rpx;
  }
}

.carts {
  padding: 0 20rpx;

  .card {
    display: flex;
    padding: 20rpx 20rpx 20rpx 80rpx;
    border-radius: 10rpx;
    background-color: #fff;
    position: relative;

    .checkbox {
      position: absolute;
      top: 0;
      left: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 80rpx;
      height: 100%;
      font-size: 40rpx;
      color: #444;
    }

    .icon-checked {
      color: #27ba9b;
    }

    .thumb {
      width: 170rpx;
      height: 170rpx;
    }

    .meta {
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      margin-left: 20rpx;
    }

    .name {
      height: 72rpx;
      font-size: 26rpx;
      color: #444;
    }

    .type {
      line-height: 1.8;
      padding: 0 15rpx;
      font-size: 24rpx;
      align-self: flex-start;
      border-radius: 4rpx;
      color: #888;
      background-color: #f7f7f8;
    }

    .price {
      line-height: 1;
      font-size: 26rpx;
      color: #444;
      margin-bottom: 2rpx;
    }

    .warning {
      color: #cf4444;
      font-size: 24rpx;
    }

    .quantity {
      position: absolute;
      bottom: 20rpx;
      right: 5rpx;
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 220rpx;
      height: 48rpx;

      .text {
        height: 100%;
        padding: 0 20rpx;
        font-size: 32rpx;
        color: #444;
      }

      .input {
        height: 100%;
        text-align: center;
        border-radius: 4rpx;
        font-size: 24rpx;
        color: #444;
        background-color: #f6f6f6;
      }
    }
  }

  .swipe-cell {
    display: block;
    margin-top: 20rpx;

    &:first-child {
      margin-top: 0;
    }
  }
}

/* 购物车商品 */
/* 购物车状态提示 */
.blank {
  padding: 100rpx 0 60rpx;
  text-align: center;
  color: #444;
  font-size: 26rpx;

  .button {
    width: 240rpx !important;
    height: 60rpx;
    line-height: 60rpx;
    margin-top: 25rpx;
    font-size: 26rpx;
    border-radius: 60rpx;
    color: #fff;
    background-color: #27ba9b;

    &::after {
      display: none;
    }
  }
}

/* 吸底工具栏 */
.toolbar {
  position: relative;
  padding: 32rpx 20rpx 28rpx;
  border-top: 1rpx solid #ededed;
  border-bottom: 1rpx solid #ededed;
  background-color: #fff;

  .all {
    margin-left: 25rpx;
    font-size: 14px;
    color: #444;

    &::before {
      font-family: "erabbit" !important;
      content: "\e6cd";
      font-size: 36rpx;
      margin-right: 8rpx;
      vertical-align: -4rpx;
    }
  }

  .checked {
    &::before {
      content: "\e6cc";
      color: #27ba9b;
    }
  }

  .text {
    margin-right: 8rpx;
    margin-left: 32rpx;
    color: #444;
    font-size: 14px;
  }

  .amount {
    font-size: 20px;
    color: #cf4444;
    vertical-align: -1px;

    &::before {
      content: "￥";
      font-size: 12px;
    }

    .decimal {
      font-size: 12px;
    }
  }

  .buttons {
    position: absolute;
    right: 10rpx;
    top: 50%;
    display: flex;
    justify-content: space-between;
    text-align: center;
    line-height: 72rpx;
    font-size: 13px;
    color: #fff;
    transform: translateY(-50%);

    .button {
      width: 240rpx;
      margin: 0 10rpx;
      border-radius: 72rpx;
    }
  }

  .payment {
    background-color: #27ba9b;
  }

  .disabled {
    opacity: 0.6;
  }

  .delete {
    display: none;
    background-color: #27ba9b;
  }

  .collect {
    display: none;
    background-color: #ffa868;
  }
}

.swipe-cell-action {
  display: flex;
  height: 100%;

  button {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    padding: 6px;
    line-height: 1.5;
    color: #fff;
    font-size: 26rpx;
    border-radius: 0;
  }

  .collect-button {
    background-color: #ffa868;
  }

  .delete-button {
    background-color: #cf4444;
  }
}
</style>